Add Qt3 development HEAD version

1 files changed, 747 insertions, 0 deletions

diff --git a/examples/canvas/canvas.cpp b/examples/canvas/canvas.cpp
new file mode 100644
index 0000000..1f33949
--- /dev/null
+++ b/examples/canvas/canvas.cpp
@@ -0,0 +1,747 @@
+#include <qdatetime.h>
+#include <qmainwindow.h>
+#include <qstatusbar.h>
+#include <qmessagebox.h>
+#include <qmenubar.h>
+#include <qapplication.h>
+#include <qpainter.h>
+#include <qprinter.h>
+#include <qlabel.h>
+#include <qimage.h>
+#include <qprogressdialog.h>
+#include "canvas.h"
+
+#include <stdlib.h>
+
+// We use a global variable to save memory - all the brushes and pens in
+// the mesh are shared.
+static QBrush *tb = 0;
+static QPen *tp = 0;
+
+class EdgeItem;
+class NodeItem;
+
+class EdgeItem: public QCanvasLine
+{
+public:
+    EdgeItem( NodeItem*, NodeItem*, QCanvas *canvas );
+    void setFromPoint( int x, int y ) ;
+    void setToPoint( int x, int y );
+    static int count() { return c; }
+    void moveBy(double dx, double dy);
+private:
+    static int c;
+};
+
+static const int imageRTTI = 984376;
+
+
+class ImageItem: public QCanvasRectangle
+{
+public:
+    ImageItem( QImage img, QCanvas *canvas );
+    int rtti () const { return imageRTTI; }
+    bool hit( const QPoint&) const;
+protected:
+    void drawShape( QPainter & );
+private:
+    QImage image;
+    QPixmap pixmap;
+};
+
+
+ImageItem::ImageItem( QImage img, QCanvas *canvas )
+    : QCanvasRectangle( canvas ), image(img)
+{
+    setSize( image.width(), image.height() );
+
+#if !defined(Q_WS_QWS)
+    pixmap.convertFromImage(image, OrderedAlphaDither);
+#endif
+}
+
+
+void ImageItem::drawShape( QPainter &p )
+{
+// On Qt/Embedded, we can paint a QImage as fast as a QPixmap,
+// but on other platforms, we need to use a QPixmap.
+#if defined(Q_WS_QWS)
+    p.drawImage( int(x()), int(y()), image, 0, 0, -1, -1, OrderedAlphaDither );
+#else
+    p.drawPixmap( int(x()), int(y()), pixmap );
+#endif
+}
+
+bool ImageItem::hit( const QPoint &p ) const
+{
+    int ix = p.x()-int(x());
+    int iy = p.y()-int(y());
+    if ( !image.valid( ix , iy ) )
+	return FALSE;
+    QRgb pixel = image.pixel( ix, iy );
+    return qAlpha( pixel ) != 0;
+}
+
+class NodeItem: public QCanvasEllipse
+{
+public:
+    NodeItem( QCanvas *canvas );
+    ~NodeItem() {}
+
+    void addInEdge( EdgeItem *edge ) { inList.append( edge ); }
+    void addOutEdge( EdgeItem *edge ) { outList.append( edge ); }
+
+    void moveBy(double dx, double dy);
+
+    //    QPoint center() { return boundingRect().center(); }
+private:
+    QPtrList<EdgeItem> inList;
+    QPtrList<EdgeItem> outList;
+};
+
+
+int EdgeItem::c = 0;
+
+
+void EdgeItem::moveBy(double, double)
+{
+    //nothing
+}
+
+EdgeItem::EdgeItem( NodeItem *from, NodeItem *to, QCanvas *canvas )
+    : QCanvasLine( canvas )
+{
+    c++;
+    setPen( *tp );
+    setBrush( *tb );
+    from->addOutEdge( this );
+    to->addInEdge( this );
+    setPoints( int(from->x()), int(from->y()), int(to->x()), int(to->y()) );
+    setZ( 127 );
+}
+
+void EdgeItem::setFromPoint( int x, int y )
+{
+    setPoints( x,y, endPoint().x(), endPoint().y() );
+}
+
+void EdgeItem::setToPoint( int x, int y )
+{
+    setPoints( startPoint().x(), startPoint().y(), x, y );
+}
+
+
+
+void NodeItem::moveBy(double dx, double dy)
+{
+    QCanvasEllipse::moveBy( dx, dy );
+
+    QPtrListIterator<EdgeItem> it1( inList );
+    EdgeItem *edge;
+    while (( edge = it1.current() )) {
+	++it1;
+	edge->setToPoint( int(x()), int(y()) );
+    }
+    QPtrListIterator<EdgeItem> it2( outList );
+    while (( edge = it2.current() )) {
+	++it2;
+	edge->setFromPoint( int(x()), int(y()) );
+    }
+}
+
+NodeItem::NodeItem( QCanvas *canvas )
+    : QCanvasEllipse( 6, 6, canvas )
+{
+    setPen( *tp );
+    setBrush( *tb );
+    setZ( 128 );
+}
+
+FigureEditor::FigureEditor(
+	QCanvas& c, QWidget* parent,
+	const char* name, WFlags f) :
+    QCanvasView(&c,parent,name,f)
+{
+}
+
+void FigureEditor::contentsMousePressEvent(QMouseEvent* e)
+{
+    QPoint p = inverseWorldMatrix().map(e->pos());
+    QCanvasItemList l=canvas()->collisions(p);
+    for (QCanvasItemList::Iterator it=l.begin(); it!=l.end(); ++it) {
+	if ( (*it)->rtti() == imageRTTI ) {
+	    ImageItem *item= (ImageItem*)(*it);
+	    if ( !item->hit( p ) )
+		 continue;
+	}
+	moving = *it;
+	moving_start = p;
+	return;
+    }
+    moving = 0;
+}
+
+void FigureEditor::clear()
+{
+    QCanvasItemList list = canvas()->allItems();
+    QCanvasItemList::Iterator it = list.begin();
+    for (; it != list.end(); ++it) {
+	if ( *it )
+	    delete *it;
+    }
+}
+
+void FigureEditor::contentsMouseMoveEvent(QMouseEvent* e)
+{
+    if ( moving ) {
+	QPoint p = inverseWorldMatrix().map(e->pos());
+	moving->moveBy(p.x() - moving_start.x(),
+		       p.y() - moving_start.y());
+	moving_start = p;
+	canvas()->update();
+    }
+}
+
+
+
+BouncyLogo::BouncyLogo(QCanvas* canvas) :
+    QCanvasSprite(0,canvas)
+{
+    static QCanvasPixmapArray logo("qt-trans.xpm");
+    setSequence(&logo);
+    setAnimated(TRUE);
+    initPos();
+}
+
+
+const int logo_rtti = 1234;
+
+int BouncyLogo::rtti() const
+{
+    return logo_rtti;
+}
+
+void BouncyLogo::initPos()
+{
+    initSpeed();
+    int trial=1000;
+    do {
+	move(rand()%canvas()->width(),rand()%canvas()->height());
+	advance(0);
+    } while (trial-- && xVelocity()==0.0 && yVelocity()==0.0);
+}
+
+void BouncyLogo::initSpeed()
+{
+    const double speed = 4.0;
+    double d = (double)(rand()%1024) / 1024.0;
+    setVelocity( d*speed*2-speed, (1-d)*speed*2-speed );
+}
+
+void BouncyLogo::advance(int stage)
+{
+    switch ( stage ) {
+      case 0: {
+	double vx = xVelocity();
+	double vy = yVelocity();
+
+	if ( vx == 0.0 && vy == 0.0 ) {
+	    // stopped last turn
+	    initSpeed();
+	    vx = xVelocity();
+	    vy = yVelocity();
+	}
+
+	double nx = x() + vx;
+	double ny = y() + vy;
+
+	if ( nx < 0 || nx >= canvas()->width() )
+	    vx = -vx;
+	if ( ny < 0 || ny >= canvas()->height() )
+	    vy = -vy;
+
+	for (int bounce=0; bounce<4; bounce++) {
+	    QCanvasItemList l=collisions(FALSE);
+	    for (QCanvasItemList::Iterator it=l.begin(); it!=l.end(); ++it) {
+		QCanvasItem *hit = *it;
+		if ( hit->rtti()==logo_rtti && hit->collidesWith(this) ) {
+		    switch ( bounce ) {
+		      case 0:
+			vx = -vx;
+			break;
+		      case 1:
+			vy = -vy;
+			vx = -vx;
+			break;
+		      case 2:
+			vx = -vx;
+			break;
+		      case 3:
+			// Stop for this turn
+			vx = 0;
+			vy = 0;
+			break;
+		    }
+		    setVelocity(vx,vy);
+		    break;
+		}
+	    }
+	}
+
+	if ( x()+vx < 0 || x()+vx >= canvas()->width() )
+	    vx = 0;
+	if ( y()+vy < 0 || y()+vy >= canvas()->height() )
+	    vy = 0;
+
+	setVelocity(vx,vy);
+      } break;
+      case 1:
+	QCanvasItem::advance(stage);
+	break;
+    }
+}
+
+static uint mainCount = 0;
+static QImage *butterflyimg;
+static QImage *logoimg;
+
+Main::Main(QCanvas& c, QWidget* parent, const char* name, WFlags f) :
+    QMainWindow(parent,name,f),
+    canvas(c)
+{
+    editor = new FigureEditor(canvas,this);
+    QMenuBar* menu = menuBar();
+
+    QPopupMenu* file = new QPopupMenu( menu );
+    file->insertItem("&Fill canvas", this, SLOT(init()), CTRL+Key_F);
+    file->insertItem("&Erase canvas", this, SLOT(clear()), CTRL+Key_E);
+    file->insertItem("&New view", this, SLOT(newView()), CTRL+Key_N);
+    file->insertSeparator();
+    file->insertItem("&Print...", this, SLOT(print()), CTRL+Key_P);
+    file->insertSeparator();
+    file->insertItem("E&xit", qApp, SLOT(quit()), CTRL+Key_Q);
+    menu->insertItem("&File", file);
+
+    QPopupMenu* edit = new QPopupMenu( menu );
+    edit->insertItem("Add &Circle", this, SLOT(addCircle()), ALT+Key_C);
+    edit->insertItem("Add &Hexagon", this, SLOT(addHexagon()), ALT+Key_H);
+    edit->insertItem("Add &Polygon", this, SLOT(addPolygon()), ALT+Key_P);
+    edit->insertItem("Add Spl&ine", this, SLOT(addSpline()), ALT+Key_I);
+    edit->insertItem("Add &Text", this, SLOT(addText()), ALT+Key_T);
+    edit->insertItem("Add &Line", this, SLOT(addLine()), ALT+Key_L);
+    edit->insertItem("Add &Rectangle", this, SLOT(addRectangle()), ALT+Key_R);
+    edit->insertItem("Add &Sprite", this, SLOT(addSprite()), ALT+Key_S);
+    edit->insertItem("Create &Mesh", this, SLOT(addMesh()), ALT+Key_M );
+    edit->insertItem("Add &Alpha-blended image", this, SLOT(addButterfly()), ALT+Key_A);
+    menu->insertItem("&Edit", edit);
+
+    QPopupMenu* view = new QPopupMenu( menu );
+    view->insertItem("&Enlarge", this, SLOT(enlarge()), SHIFT+CTRL+Key_Plus);
+    view->insertItem("Shr&ink", this, SLOT(shrink()), SHIFT+CTRL+Key_Minus);
+    view->insertSeparator();
+    view->insertItem("&Rotate clockwise", this, SLOT(rotateClockwise()), CTRL+Key_PageDown);
+    view->insertItem("Rotate &counterclockwise", this, SLOT(rotateCounterClockwise()), CTRL+Key_PageUp);
+    view->insertItem("&Zoom in", this, SLOT(zoomIn()), CTRL+Key_Plus);
+    view->insertItem("Zoom &out", this, SLOT(zoomOut()), CTRL+Key_Minus);
+    view->insertItem("Translate left", this, SLOT(moveL()), CTRL+Key_Left);
+    view->insertItem("Translate right", this, SLOT(moveR()), CTRL+Key_Right);
+    view->insertItem("Translate up", this, SLOT(moveU()), CTRL+Key_Up);
+    view->insertItem("Translate down", this, SLOT(moveD()), CTRL+Key_Down);
+    view->insertItem("&Mirror", this, SLOT(mirror()), CTRL+Key_Home);
+    menu->insertItem("&View", view);
+
+    options = new QPopupMenu( menu );
+    dbf_id = options->insertItem("Double buffer", this, SLOT(toggleDoubleBuffer()));
+    options->setItemChecked(dbf_id, TRUE);
+    menu->insertItem("&Options",options);
+
+    menu->insertSeparator();
+
+    QPopupMenu* help = new QPopupMenu( menu );
+    help->insertItem("&About", this, SLOT(help()), Key_F1);
+    help->setItemChecked(dbf_id, TRUE);
+    menu->insertItem("&Help",help);
+
+    statusBar();
+
+    setCentralWidget(editor);
+
+    printer = 0;
+
+    init();
+}
+
+void Main::init()
+{
+    clear();
+
+    static int r=24;
+    srand(++r);
+
+    mainCount++;
+    butterflyimg = 0;
+    logoimg = 0;
+
+    int i;
+    for ( i=0; i<canvas.width() / 56; i++) {
+	addButterfly();
+    }
+    for ( i=0; i<canvas.width() / 85; i++) {
+	addHexagon();
+    }
+    for ( i=0; i<canvas.width() / 128; i++) {
+	addLogo();
+    }
+}
+
+Main::~Main()
+{
+    delete printer;
+    if ( !--mainCount ) {
+	delete[] butterflyimg;
+	butterflyimg = 0;
+	delete[] logoimg;
+	logoimg = 0;
+    }
+}
+
+void Main::newView()
+{
+    // Open a new view... have it delete when closed.
+    Main *m = new Main(canvas, 0, 0, WDestructiveClose);
+    qApp->setMainWidget(m);
+    m->show();
+    qApp->setMainWidget(0);
+}
+
+void Main::clear()
+{
+    editor->clear();
+}
+
+void Main::help()
+{
+    static QMessageBox* about = new QMessageBox( "Qt Canvas Example",
+	    "<h3>The QCanvas classes example</h3>"
+	    "<ul>"
+		"<li> Press ALT-S for some sprites."
+		"<li> Press ALT-C for some circles."
+		"<li> Press ALT-L for some lines."
+		"<li> Drag the objects around."
+		"<li> Read the code!"
+	    "</ul>", QMessageBox::Information, 1, 0, 0, this, 0, FALSE );
+    about->setButtonText( 1, "Dismiss" );
+    about->show();
+}
+
+void Main::aboutQt()
+{
+    QMessageBox::aboutQt( this, "Qt Canvas Example" );
+}
+
+void Main::toggleDoubleBuffer()
+{
+    bool s = !options->isItemChecked(dbf_id);
+    options->setItemChecked(dbf_id,s);
+    canvas.setDoubleBuffering(s);
+}
+
+void Main::enlarge()
+{
+    canvas.resize(canvas.width()*4/3, canvas.height()*4/3);
+}
+
+void Main::shrink()
+{
+    canvas.resize(canvas.width()*3/4, canvas.height()*3/4);
+}
+
+void Main::rotateClockwise()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.rotate( 22.5 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::rotateCounterClockwise()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.rotate( -22.5 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::zoomIn()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.scale( 2.0, 2.0 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::zoomOut()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.scale( 0.5, 0.5 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::mirror()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.scale( -1, 1 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::moveL()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.translate( -16, 0 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::moveR()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.translate( +16, 0 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::moveU()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.translate( 0, -16 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::moveD()
+{
+    QWMatrix m = editor->worldMatrix();
+    m.translate( 0, +16 );
+    editor->setWorldMatrix( m );
+}
+
+void Main::print()
+{
+    if ( !printer ) printer = new QPrinter;
+    if ( printer->setup(this) ) {
+	QPainter pp(printer);
+	canvas.drawArea(QRect(0,0,canvas.width(),canvas.height()),&pp,FALSE);
+    }
+}
+
+
+void Main::addSprite()
+{
+    QCanvasItem* i = new BouncyLogo(&canvas);
+    i->setZ(rand()%256);
+    i->show();
+}
+
+QString butterfly_fn;
+QString logo_fn;
+
+
+void Main::addButterfly()
+{
+    if ( butterfly_fn.isEmpty() )
+	return;
+    if ( !butterflyimg ) {
+	butterflyimg = new QImage[4];
+	butterflyimg[0].load( butterfly_fn );
+	butterflyimg[1] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.75),
+		int(butterflyimg[0].height()*0.75) );
+	butterflyimg[2] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.5),
+		int(butterflyimg[0].height()*0.5) );
+	butterflyimg[3] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.25),
+		int(butterflyimg[0].height()*0.25) );
+    }
+    QCanvasPolygonalItem* i = new ImageItem(butterflyimg[rand()%4],&canvas);
+    i->move(rand()%(canvas.width()-butterflyimg->width()),
+	    rand()%(canvas.height()-butterflyimg->height()));
+    i->setZ(rand()%256+250);
+    i->show();
+}
+
+void Main::addLogo()
+{
+    if ( logo_fn.isEmpty() )
+	return;
+    if ( !logoimg ) {
+	logoimg = new QImage[4];
+	logoimg[0].load( logo_fn );
+	logoimg[1] = logoimg[0].smoothScale( int(logoimg[0].width()*0.75),
+		int(logoimg[0].height()*0.75) );
+	logoimg[2] = logoimg[0].smoothScale( int(logoimg[0].width()*0.5),
+		int(logoimg[0].height()*0.5) );
+	logoimg[3] = logoimg[0].smoothScale( int(logoimg[0].width()*0.25),
+		int(logoimg[0].height()*0.25) );
+    }
+    QCanvasPolygonalItem* i = new ImageItem(logoimg[rand()%4],&canvas);
+    i->move(rand()%(canvas.width()-logoimg->width()),
+	    rand()%(canvas.height()-logoimg->width()));
+    i->setZ(rand()%256+256);
+    i->show();
+}
+
+
+
+void Main::addCircle()
+{
+    QCanvasPolygonalItem* i = new QCanvasEllipse(50,50,&canvas);
+    i->setBrush( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
+    i->move(rand()%canvas.width(),rand()%canvas.height());
+    i->setZ(rand()%256);
+    i->show();
+}
+
+void Main::addHexagon()
+{
+    QCanvasPolygon* i = new QCanvasPolygon(&canvas);
+    const int size = canvas.width() / 25;
+    QPointArray pa(6);
+    pa[0] = QPoint(2*size,0);
+    pa[1] = QPoint(size,-size*173/100);
+    pa[2] = QPoint(-size,-size*173/100);
+    pa[3] = QPoint(-2*size,0);
+    pa[4] = QPoint(-size,size*173/100);
+    pa[5] = QPoint(size,size*173/100);
+    i->setPoints(pa);
+    i->setBrush( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
+    i->move(rand()%canvas.width(),rand()%canvas.height());
+    i->setZ(rand()%256);
+    i->show();
+}
+
+void Main::addPolygon()
+{
+    QCanvasPolygon* i = new QCanvasPolygon(&canvas);
+    const int size = canvas.width()/2;
+    QPointArray pa(6);
+    pa[0] = QPoint(0,0);
+    pa[1] = QPoint(size,size/5);
+    pa[2] = QPoint(size*4/5,size);
+    pa[3] = QPoint(size/6,size*5/4);
+    pa[4] = QPoint(size*3/4,size*3/4);
+    pa[5] = QPoint(size*3/4,size/4);
+    i->setPoints(pa);
+    i->setBrush( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
+    i->move(rand()%canvas.width(),rand()%canvas.height());
+    i->setZ(rand()%256);
+    i->show();
+}
+
+void Main::addSpline()
+{
+    QCanvasSpline* i = new QCanvasSpline(&canvas);
+    const int size = canvas.width()/6;
+    QPointArray pa(12);
+    pa[0] = QPoint(0,0);
+    pa[1] = QPoint(size/2,0);
+    pa[2] = QPoint(size,size/2);
+    pa[3] = QPoint(size,size);
+    pa[4] = QPoint(size,size*3/2);
+    pa[5] = QPoint(size/2,size*2);
+    pa[6] = QPoint(0,size*2);
+    pa[7] = QPoint(-size/2,size*2);
+    pa[8] = QPoint(size/4,size*3/2);
+    pa[9] = QPoint(0,size);
+    pa[10]= QPoint(-size/4,size/2);
+    pa[11]= QPoint(-size/2,0);
+    i->setControlPoints(pa);
+    i->setBrush( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
+    i->move(rand()%canvas.width(),rand()%canvas.height());
+    i->setZ(rand()%256);
+    i->show();
+}
+
+void Main::addText()
+{
+    QCanvasText* i = new QCanvasText(&canvas);
+    i->setText("QCanvasText");
+    i->move(rand()%canvas.width(),rand()%canvas.height());
+    i->setZ(rand()%256);
+    i->show();
+}
+
+void Main::addLine()
+{
+    QCanvasLine* i = new QCanvasLine(&canvas);
+    i->setPoints( rand()%canvas.width(), rand()%canvas.height(),
+		  rand()%canvas.width(), rand()%canvas.height() );
+    i->setPen( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) );
+    i->setZ(rand()%256);
+    i->show();
+}
+
+void Main::addMesh()
+{
+    int x0 = 0;
+    int y0 = 0;
+
+    if ( !tb ) tb = new QBrush( Qt::red );
+    if ( !tp ) tp = new QPen( Qt::black );
+
+    int nodecount = 0;
+
+    int w = canvas.width();
+    int h = canvas.height();
+
+    const int dist = 30;
+    int rows = h / dist;
+    int cols = w / dist;
+
+#ifndef QT_NO_PROGRESSDIALOG
+    QProgressDialog progress( "Creating mesh...", "Abort", rows,
+			      this, "progress", TRUE );
+#endif
+
+    QMemArray<NodeItem*> lastRow(cols);
+    for ( int j = 0; j < rows; j++ ) {
+	int n = j%2 ? cols-1 : cols;
+	NodeItem *prev = 0;
+	for ( int i = 0; i < n; i++ ) {
+	    NodeItem *el = new NodeItem( &canvas );
+	    nodecount++;
+	    int r = rand();
+	    int xrand = r %20;
+	    int yrand = (r/20) %20;
+	    el->move( xrand + x0 + i*dist + (j%2 ? dist/2 : 0 ),
+		      yrand + y0 + j*dist );
+
+	    if ( j > 0 ) {
+		if ( i < cols-1 )
+		    (new EdgeItem( lastRow[i], el, &canvas ))->show();
+		if ( j%2 )
+		    (new EdgeItem( lastRow[i+1], el, &canvas ))->show();
+		else if ( i > 0 )
+		    (new EdgeItem( lastRow[i-1], el, &canvas ))->show();
+	    }
+	    if ( prev ) {
+		(new EdgeItem( prev, el, &canvas ))->show();
+	    }
+	    if ( i > 0 ) lastRow[i-1] = prev;
+	    prev = el;
+	    el->show();
+	}
+	lastRow[n-1]=prev;
+#ifndef QT_NO_PROGRESSDIALOG
+	progress.setProgress( j );
+	if ( progress.wasCancelled() )
+	    break;
+#endif
+    }
+#ifndef QT_NO_PROGRESSDIALOG
+    progress.setProgress( rows );
+#endif
+    // qDebug( "%d nodes, %d edges", nodecount, EdgeItem::count() );
+}
+
+void Main::addRectangle()
+{
+    QCanvasPolygonalItem *i = new QCanvasRectangle( rand()%canvas.width(),rand()%canvas.height(),
+			    canvas.width()/5,canvas.width()/5,&canvas);
+    int z = rand()%256;
+    i->setBrush( QColor(z,z,z) );
+    i->setPen( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) );
+    i->setZ(z);
+    i->show();
+}